resize an image in proportion with CSS, is it possible?

Question

Is there a way to resize images retaining their proportions with CSS?

The container has a fixed width and height

Answer 1

.theimage{
    width:100%;
    height:auto;
}

or

.theimage{
    width:auto;
    height:100%;
}

Depending on how you wanna give the scale preference... :) :)

Thats all.